Just add 3/4 cup of water and heat it in the microwave for 2 minutes (the jar gets super hot, so be sure to use potholders when you remove the jar from the microwave). (jeanetteshealthyliving.com)
And for just a little more personality, we put a little hook on each side for potholders. (theinspiredroom.net)
I first came across the idea of using a silicone potholder also called a «trivet» as a chocolate chip mold in a Facebook group conversation a while back. (forestandfauna.com)